Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Machine check handler. | |
3 | * K8 parts Copyright 2002,2003 Andi Kleen, SuSE Labs. | |
4 | * Rest from unknown author(s). | |
5 | * 2004 Andi Kleen. Rewrote most of it. | |
6 | */ | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/rcupdate.h> | |
14 | #include <linux/kallsyms.h> | |
15 | #include <linux/sysdev.h> | |
16 | #include <linux/miscdevice.h> | |
17 | #include <linux/fs.h> | |
a9415644 | 18 | #include <linux/capability.h> |
91c6d400 AK |
19 | #include <linux/cpu.h> |
20 | #include <linux/percpu.h> | |
8c566ef5 | 21 | #include <linux/ctype.h> |
1da177e4 LT |
22 | #include <asm/processor.h> |
23 | #include <asm/msr.h> | |
24 | #include <asm/mce.h> | |
25 | #include <asm/kdebug.h> | |
26 | #include <asm/uaccess.h> | |
27 | ||
28 | #define MISC_MCELOG_MINOR 227 | |
73ca5358 | 29 | #define NR_BANKS 6 |
1da177e4 LT |
30 | |
31 | static int mce_dont_init; | |
32 | ||
33 | /* 0: always panic, 1: panic if deadlock possible, 2: try to avoid panic, | |
34 | 3: never panic or exit (for testing only) */ | |
35 | static int tolerant = 1; | |
36 | static int banks; | |
37 | static unsigned long bank[NR_BANKS] = { [0 ... NR_BANKS-1] = ~0UL }; | |
38 | static unsigned long console_logged; | |
39 | static int notify_user; | |
94ad8474 | 40 | static int rip_msr; |
e583538f | 41 | static int mce_bootlog = 1; |
1da177e4 LT |
42 | |
43 | /* | |
44 | * Lockless MCE logging infrastructure. | |
45 | * This avoids deadlocks on printk locks without having to break locks. Also | |
46 | * separate MCEs from kernel messages to avoid bogus bug reports. | |
47 | */ | |
48 | ||
49 | struct mce_log mcelog = { | |
50 | MCE_LOG_SIGNATURE, | |
51 | MCE_LOG_LEN, | |
52 | }; | |
53 | ||
54 | void mce_log(struct mce *mce) | |
55 | { | |
56 | unsigned next, entry; | |
57 | mce->finished = 0; | |
7644143c | 58 | wmb(); |
1da177e4 LT |
59 | for (;;) { |
60 | entry = rcu_dereference(mcelog.next); | |
7644143c MW |
61 | /* The rmb forces the compiler to reload next in each |
62 | iteration */ | |
63 | rmb(); | |
673242c1 AK |
64 | for (;;) { |
65 | /* When the buffer fills up discard new entries. Assume | |
66 | that the earlier errors are the more interesting. */ | |
67 | if (entry >= MCE_LOG_LEN) { | |
68 | set_bit(MCE_OVERFLOW, &mcelog.flags); | |
69 | return; | |
70 | } | |
71 | /* Old left over entry. Skip. */ | |
72 | if (mcelog.entry[entry].finished) { | |
73 | entry++; | |
74 | continue; | |
75 | } | |
7644143c | 76 | break; |
1da177e4 | 77 | } |
1da177e4 LT |
78 | smp_rmb(); |
79 | next = entry + 1; | |
80 | if (cmpxchg(&mcelog.next, entry, next) == entry) | |
81 | break; | |
82 | } | |
83 | memcpy(mcelog.entry + entry, mce, sizeof(struct mce)); | |
7644143c | 84 | wmb(); |
1da177e4 | 85 | mcelog.entry[entry].finished = 1; |
7644143c | 86 | wmb(); |
1da177e4 LT |
87 | |
88 | if (!test_and_set_bit(0, &console_logged)) | |
89 | notify_user = 1; | |
90 | } | |
91 | ||
92 | static void print_mce(struct mce *m) | |
93 | { | |
94 | printk(KERN_EMERG "\n" | |
4855170f | 95 | KERN_EMERG "HARDWARE ERROR\n" |
1da177e4 LT |
96 | KERN_EMERG |
97 | "CPU %d: Machine Check Exception: %16Lx Bank %d: %016Lx\n", | |
98 | m->cpu, m->mcgstatus, m->bank, m->status); | |
99 | if (m->rip) { | |
100 | printk(KERN_EMERG | |
101 | "RIP%s %02x:<%016Lx> ", | |
102 | !(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "", | |
103 | m->cs, m->rip); | |
104 | if (m->cs == __KERNEL_CS) | |
105 | print_symbol("{%s}", m->rip); | |
106 | printk("\n"); | |
107 | } | |
108 | printk(KERN_EMERG "TSC %Lx ", m->tsc); | |
109 | if (m->addr) | |
110 | printk("ADDR %Lx ", m->addr); | |
111 | if (m->misc) | |
112 | printk("MISC %Lx ", m->misc); | |
113 | printk("\n"); | |
4855170f AK |
114 | printk(KERN_EMERG "This is not a software problem!\n"); |
115 | printk(KERN_EMERG | |
116 | "Run through mcelog --ascii to decode and contact your hardware vendor\n"); | |
1da177e4 LT |
117 | } |
118 | ||
119 | static void mce_panic(char *msg, struct mce *backup, unsigned long start) | |
120 | { | |
121 | int i; | |
122 | oops_begin(); | |
123 | for (i = 0; i < MCE_LOG_LEN; i++) { | |
124 | unsigned long tsc = mcelog.entry[i].tsc; | |
125 | if (time_before(tsc, start)) | |
126 | continue; | |
127 | print_mce(&mcelog.entry[i]); | |
128 | if (backup && mcelog.entry[i].tsc == backup->tsc) | |
129 | backup = NULL; | |
130 | } | |
131 | if (backup) | |
132 | print_mce(backup); | |
133 | if (tolerant >= 3) | |
134 | printk("Fake panic: %s\n", msg); | |
135 | else | |
136 | panic(msg); | |
137 | } | |
138 | ||
139 | static int mce_available(struct cpuinfo_x86 *c) | |
140 | { | |
141 | return test_bit(X86_FEATURE_MCE, &c->x86_capability) && | |
142 | test_bit(X86_FEATURE_MCA, &c->x86_capability); | |
143 | } | |
144 | ||
94ad8474 AK |
145 | static inline void mce_get_rip(struct mce *m, struct pt_regs *regs) |
146 | { | |
147 | if (regs && (m->mcgstatus & MCG_STATUS_RIPV)) { | |
148 | m->rip = regs->rip; | |
149 | m->cs = regs->cs; | |
150 | } else { | |
151 | m->rip = 0; | |
152 | m->cs = 0; | |
153 | } | |
154 | if (rip_msr) { | |
155 | /* Assume the RIP in the MSR is exact. Is this true? */ | |
156 | m->mcgstatus |= MCG_STATUS_EIPV; | |
157 | rdmsrl(rip_msr, m->rip); | |
158 | m->cs = 0; | |
159 | } | |
160 | } | |
161 | ||
1da177e4 LT |
162 | /* |
163 | * The actual machine check handler | |
164 | */ | |
165 | ||
166 | void do_machine_check(struct pt_regs * regs, long error_code) | |
167 | { | |
168 | struct mce m, panicm; | |
169 | int nowayout = (tolerant < 1); | |
170 | int kill_it = 0; | |
171 | u64 mcestart = 0; | |
172 | int i; | |
173 | int panicm_found = 0; | |
174 | ||
175 | if (regs) | |
6e3f3617 | 176 | notify_die(DIE_NMI, "machine check", regs, error_code, 18, SIGKILL); |
1da177e4 LT |
177 | if (!banks) |
178 | return; | |
179 | ||
180 | memset(&m, 0, sizeof(struct mce)); | |
181 | m.cpu = hard_smp_processor_id(); | |
182 | rdmsrl(MSR_IA32_MCG_STATUS, m.mcgstatus); | |
183 | if (!(m.mcgstatus & MCG_STATUS_RIPV)) | |
184 | kill_it = 1; | |
185 | ||
186 | rdtscll(mcestart); | |
187 | barrier(); | |
188 | ||
189 | for (i = 0; i < banks; i++) { | |
190 | if (!bank[i]) | |
191 | continue; | |
192 | ||
193 | m.misc = 0; | |
194 | m.addr = 0; | |
195 | m.bank = i; | |
196 | m.tsc = 0; | |
197 | ||
198 | rdmsrl(MSR_IA32_MC0_STATUS + i*4, m.status); | |
199 | if ((m.status & MCI_STATUS_VAL) == 0) | |
200 | continue; | |
201 | ||
202 | if (m.status & MCI_STATUS_EN) { | |
203 | /* In theory _OVER could be a nowayout too, but | |
204 | assume any overflowed errors were no fatal. */ | |
205 | nowayout |= !!(m.status & MCI_STATUS_PCC); | |
206 | kill_it |= !!(m.status & MCI_STATUS_UC); | |
207 | } | |
208 | ||
209 | if (m.status & MCI_STATUS_MISCV) | |
210 | rdmsrl(MSR_IA32_MC0_MISC + i*4, m.misc); | |
211 | if (m.status & MCI_STATUS_ADDRV) | |
212 | rdmsrl(MSR_IA32_MC0_ADDR + i*4, m.addr); | |
213 | ||
94ad8474 | 214 | mce_get_rip(&m, regs); |
d5172f26 | 215 | if (error_code >= 0) |
1da177e4 LT |
216 | rdtscll(m.tsc); |
217 | wrmsrl(MSR_IA32_MC0_STATUS + i*4, 0); | |
d5172f26 AK |
218 | if (error_code != -2) |
219 | mce_log(&m); | |
1da177e4 LT |
220 | |
221 | /* Did this bank cause the exception? */ | |
222 | /* Assume that the bank with uncorrectable errors did it, | |
223 | and that there is only a single one. */ | |
224 | if ((m.status & MCI_STATUS_UC) && (m.status & MCI_STATUS_EN)) { | |
225 | panicm = m; | |
226 | panicm_found = 1; | |
227 | } | |
228 | ||
9f158333 | 229 | add_taint(TAINT_MACHINE_CHECK); |
1da177e4 LT |
230 | } |
231 | ||
232 | /* Never do anything final in the polling timer */ | |
233 | if (!regs) | |
234 | goto out; | |
235 | ||
236 | /* If we didn't find an uncorrectable error, pick | |
237 | the last one (shouldn't happen, just being safe). */ | |
238 | if (!panicm_found) | |
239 | panicm = m; | |
240 | if (nowayout) | |
241 | mce_panic("Machine check", &panicm, mcestart); | |
242 | if (kill_it) { | |
243 | int user_space = 0; | |
244 | ||
245 | if (m.mcgstatus & MCG_STATUS_RIPV) | |
246 | user_space = panicm.rip && (panicm.cs & 3); | |
247 | ||
248 | /* When the machine was in user space and the CPU didn't get | |
249 | confused it's normally not necessary to panic, unless you | |
250 | are paranoid (tolerant == 0) | |
251 | ||
252 | RED-PEN could be more tolerant for MCEs in idle, | |
253 | but most likely they occur at boot anyways, where | |
254 | it is best to just halt the machine. */ | |
255 | if ((!user_space && (panic_on_oops || tolerant < 2)) || | |
256 | (unsigned)current->pid <= 1) | |
257 | mce_panic("Uncorrected machine check", &panicm, mcestart); | |
258 | ||
259 | /* do_exit takes an awful lot of locks and has as | |
260 | slight risk of deadlocking. If you don't want that | |
261 | don't set tolerant >= 2 */ | |
262 | if (tolerant < 3) | |
263 | do_exit(SIGBUS); | |
264 | } | |
265 | ||
266 | out: | |
267 | /* Last thing done in the machine check exception to clear state. */ | |
268 | wrmsrl(MSR_IA32_MCG_STATUS, 0); | |
269 | } | |
270 | ||
271 | /* | |
272 | * Periodic polling timer for "silent" machine check errors. | |
273 | */ | |
274 | ||
275 | static int check_interval = 5 * 60; /* 5 minutes */ | |
276 | static void mcheck_timer(void *data); | |
277 | static DECLARE_WORK(mcheck_work, mcheck_timer, NULL); | |
278 | ||
279 | static void mcheck_check_cpu(void *info) | |
280 | { | |
281 | if (mce_available(¤t_cpu_data)) | |
282 | do_machine_check(NULL, 0); | |
283 | } | |
284 | ||
285 | static void mcheck_timer(void *data) | |
286 | { | |
287 | on_each_cpu(mcheck_check_cpu, NULL, 1, 1); | |
288 | schedule_delayed_work(&mcheck_work, check_interval * HZ); | |
289 | ||
290 | /* | |
291 | * It's ok to read stale data here for notify_user and | |
292 | * console_logged as we'll simply get the updated versions | |
293 | * on the next mcheck_timer execution and atomic operations | |
294 | * on console_logged act as synchronization for notify_user | |
295 | * writes. | |
296 | */ | |
297 | if (notify_user && console_logged) { | |
298 | notify_user = 0; | |
299 | clear_bit(0, &console_logged); | |
300 | printk(KERN_INFO "Machine check events logged\n"); | |
301 | } | |
302 | } | |
303 | ||
304 | ||
305 | static __init int periodic_mcheck_init(void) | |
306 | { | |
307 | if (check_interval) | |
308 | schedule_delayed_work(&mcheck_work, check_interval*HZ); | |
309 | return 0; | |
310 | } | |
311 | __initcall(periodic_mcheck_init); | |
312 | ||
313 | ||
314 | /* | |
315 | * Initialize Machine Checks for a CPU. | |
316 | */ | |
317 | static void mce_init(void *dummy) | |
318 | { | |
319 | u64 cap; | |
320 | int i; | |
321 | ||
322 | rdmsrl(MSR_IA32_MCG_CAP, cap); | |
323 | banks = cap & 0xff; | |
324 | if (banks > NR_BANKS) { | |
325 | printk(KERN_INFO "MCE: warning: using only %d banks\n", banks); | |
326 | banks = NR_BANKS; | |
327 | } | |
94ad8474 AK |
328 | /* Use accurate RIP reporting if available. */ |
329 | if ((cap & (1<<9)) && ((cap >> 16) & 0xff) >= 9) | |
330 | rip_msr = MSR_IA32_MCG_EIP; | |
1da177e4 LT |
331 | |
332 | /* Log the machine checks left over from the previous reset. | |
333 | This also clears all registers */ | |
d5172f26 | 334 | do_machine_check(NULL, mce_bootlog ? -1 : -2); |
1da177e4 LT |
335 | |
336 | set_in_cr4(X86_CR4_MCE); | |
337 | ||
338 | if (cap & MCG_CTL_P) | |
339 | wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff); | |
340 | ||
341 | for (i = 0; i < banks; i++) { | |
342 | wrmsrl(MSR_IA32_MC0_CTL+4*i, bank[i]); | |
343 | wrmsrl(MSR_IA32_MC0_STATUS+4*i, 0); | |
344 | } | |
345 | } | |
346 | ||
347 | /* Add per CPU specific workarounds here */ | |
e6982c67 | 348 | static void __cpuinit mce_cpu_quirks(struct cpuinfo_x86 *c) |
1da177e4 LT |
349 | { |
350 | /* This should be disabled by the BIOS, but isn't always */ | |
351 | if (c->x86_vendor == X86_VENDOR_AMD && c->x86 == 15) { | |
352 | /* disable GART TBL walk error reporting, which trips off | |
353 | incorrectly with the IOMMU & 3ware & Cerberus. */ | |
354 | clear_bit(10, &bank[4]); | |
e583538f AK |
355 | /* Lots of broken BIOS around that don't clear them |
356 | by default and leave crap in there. Don't log. */ | |
357 | mce_bootlog = 0; | |
1da177e4 | 358 | } |
e583538f | 359 | |
1da177e4 LT |
360 | } |
361 | ||
e6982c67 | 362 | static void __cpuinit mce_cpu_features(struct cpuinfo_x86 *c) |
1da177e4 LT |
363 | { |
364 | switch (c->x86_vendor) { | |
365 | case X86_VENDOR_INTEL: | |
366 | mce_intel_feature_init(c); | |
367 | break; | |
89b831ef JS |
368 | case X86_VENDOR_AMD: |
369 | mce_amd_feature_init(c); | |
370 | break; | |
1da177e4 LT |
371 | default: |
372 | break; | |
373 | } | |
374 | } | |
375 | ||
376 | /* | |
377 | * Called for each booted CPU to set up machine checks. | |
378 | * Must be called with preempt off. | |
379 | */ | |
e6982c67 | 380 | void __cpuinit mcheck_init(struct cpuinfo_x86 *c) |
1da177e4 LT |
381 | { |
382 | static cpumask_t mce_cpus __initdata = CPU_MASK_NONE; | |
383 | ||
384 | mce_cpu_quirks(c); | |
385 | ||
386 | if (mce_dont_init || | |
387 | cpu_test_and_set(smp_processor_id(), mce_cpus) || | |
388 | !mce_available(c)) | |
389 | return; | |
390 | ||
391 | mce_init(NULL); | |
392 | mce_cpu_features(c); | |
393 | } | |
394 | ||
395 | /* | |
396 | * Character device to read and clear the MCE log. | |
397 | */ | |
398 | ||
399 | static void collect_tscs(void *data) | |
400 | { | |
401 | unsigned long *cpu_tsc = (unsigned long *)data; | |
402 | rdtscll(cpu_tsc[smp_processor_id()]); | |
403 | } | |
404 | ||
405 | static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff_t *off) | |
406 | { | |
f0de53bb | 407 | unsigned long *cpu_tsc; |
1da177e4 LT |
408 | static DECLARE_MUTEX(mce_read_sem); |
409 | unsigned next; | |
410 | char __user *buf = ubuf; | |
411 | int i, err; | |
412 | ||
f0de53bb AK |
413 | cpu_tsc = kmalloc(NR_CPUS * sizeof(long), GFP_KERNEL); |
414 | if (!cpu_tsc) | |
415 | return -ENOMEM; | |
416 | ||
1da177e4 LT |
417 | down(&mce_read_sem); |
418 | next = rcu_dereference(mcelog.next); | |
419 | ||
420 | /* Only supports full reads right now */ | |
421 | if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) { | |
422 | up(&mce_read_sem); | |
f0de53bb | 423 | kfree(cpu_tsc); |
1da177e4 LT |
424 | return -EINVAL; |
425 | } | |
426 | ||
427 | err = 0; | |
673242c1 AK |
428 | for (i = 0; i < next; i++) { |
429 | unsigned long start = jiffies; | |
430 | while (!mcelog.entry[i].finished) { | |
431 | if (!time_before(jiffies, start + 2)) { | |
432 | memset(mcelog.entry + i,0, sizeof(struct mce)); | |
433 | continue; | |
434 | } | |
435 | cpu_relax(); | |
436 | } | |
1da177e4 LT |
437 | smp_rmb(); |
438 | err |= copy_to_user(buf, mcelog.entry + i, sizeof(struct mce)); | |
439 | buf += sizeof(struct mce); | |
440 | } | |
441 | ||
442 | memset(mcelog.entry, 0, next * sizeof(struct mce)); | |
443 | mcelog.next = 0; | |
444 | ||
b2b18660 | 445 | synchronize_sched(); |
1da177e4 LT |
446 | |
447 | /* Collect entries that were still getting written before the synchronize. */ | |
448 | ||
449 | on_each_cpu(collect_tscs, cpu_tsc, 1, 1); | |
450 | for (i = next; i < MCE_LOG_LEN; i++) { | |
451 | if (mcelog.entry[i].finished && | |
452 | mcelog.entry[i].tsc < cpu_tsc[mcelog.entry[i].cpu]) { | |
453 | err |= copy_to_user(buf, mcelog.entry+i, sizeof(struct mce)); | |
454 | smp_rmb(); | |
455 | buf += sizeof(struct mce); | |
456 | memset(&mcelog.entry[i], 0, sizeof(struct mce)); | |
457 | } | |
458 | } | |
459 | up(&mce_read_sem); | |
f0de53bb | 460 | kfree(cpu_tsc); |
1da177e4 LT |
461 | return err ? -EFAULT : buf - ubuf; |
462 | } | |
463 | ||
464 | static int mce_ioctl(struct inode *i, struct file *f,unsigned int cmd, unsigned long arg) | |
465 | { | |
466 | int __user *p = (int __user *)arg; | |
467 | if (!capable(CAP_SYS_ADMIN)) | |
468 | return -EPERM; | |
469 | switch (cmd) { | |
470 | case MCE_GET_RECORD_LEN: | |
471 | return put_user(sizeof(struct mce), p); | |
472 | case MCE_GET_LOG_LEN: | |
473 | return put_user(MCE_LOG_LEN, p); | |
474 | case MCE_GETCLEAR_FLAGS: { | |
475 | unsigned flags; | |
476 | do { | |
477 | flags = mcelog.flags; | |
478 | } while (cmpxchg(&mcelog.flags, flags, 0) != flags); | |
479 | return put_user(flags, p); | |
480 | } | |
481 | default: | |
482 | return -ENOTTY; | |
483 | } | |
484 | } | |
485 | ||
486 | static struct file_operations mce_chrdev_ops = { | |
487 | .read = mce_read, | |
488 | .ioctl = mce_ioctl, | |
489 | }; | |
490 | ||
491 | static struct miscdevice mce_log_device = { | |
492 | MISC_MCELOG_MINOR, | |
493 | "mcelog", | |
494 | &mce_chrdev_ops, | |
495 | }; | |
496 | ||
497 | /* | |
498 | * Old style boot options parsing. Only for compatibility. | |
499 | */ | |
500 | ||
501 | static int __init mcheck_disable(char *str) | |
502 | { | |
503 | mce_dont_init = 1; | |
504 | return 0; | |
505 | } | |
506 | ||
507 | /* mce=off disables machine check. Note you can reenable it later | |
d5172f26 | 508 | using sysfs. |
8c566ef5 | 509 | mce=TOLERANCELEVEL (number, see above) |
e583538f AK |
510 | mce=bootlog Log MCEs from before booting. Disabled by default on AMD. |
511 | mce=nobootlog Don't log MCEs from before booting. */ | |
1da177e4 LT |
512 | static int __init mcheck_enable(char *str) |
513 | { | |
d5172f26 AK |
514 | if (*str == '=') |
515 | str++; | |
1da177e4 LT |
516 | if (!strcmp(str, "off")) |
517 | mce_dont_init = 1; | |
e583538f AK |
518 | else if (!strcmp(str, "bootlog") || !strcmp(str,"nobootlog")) |
519 | mce_bootlog = str[0] == 'b'; | |
8c566ef5 AK |
520 | else if (isdigit(str[0])) |
521 | get_option(&str, &tolerant); | |
1da177e4 LT |
522 | else |
523 | printk("mce= argument %s ignored. Please use /sys", str); | |
524 | return 0; | |
525 | } | |
526 | ||
527 | __setup("nomce", mcheck_disable); | |
528 | __setup("mce", mcheck_enable); | |
529 | ||
530 | /* | |
531 | * Sysfs support | |
532 | */ | |
533 | ||
413588c7 AK |
534 | /* On resume clear all MCE state. Don't want to see leftovers from the BIOS. |
535 | Only one CPU is active at this time, the others get readded later using | |
536 | CPU hotplug. */ | |
1da177e4 LT |
537 | static int mce_resume(struct sys_device *dev) |
538 | { | |
413588c7 | 539 | mce_init(NULL); |
1da177e4 LT |
540 | return 0; |
541 | } | |
542 | ||
543 | /* Reinit MCEs after user configuration changes */ | |
544 | static void mce_restart(void) | |
545 | { | |
546 | if (check_interval) | |
547 | cancel_delayed_work(&mcheck_work); | |
548 | /* Timer race is harmless here */ | |
549 | on_each_cpu(mce_init, NULL, 1, 1); | |
550 | if (check_interval) | |
551 | schedule_delayed_work(&mcheck_work, check_interval*HZ); | |
552 | } | |
553 | ||
554 | static struct sysdev_class mce_sysclass = { | |
555 | .resume = mce_resume, | |
556 | set_kset_name("machinecheck"), | |
557 | }; | |
558 | ||
91c6d400 | 559 | static DEFINE_PER_CPU(struct sys_device, device_mce); |
1da177e4 LT |
560 | |
561 | /* Why are there no generic functions for this? */ | |
562 | #define ACCESSOR(name, var, start) \ | |
563 | static ssize_t show_ ## name(struct sys_device *s, char *buf) { \ | |
564 | return sprintf(buf, "%lx\n", (unsigned long)var); \ | |
565 | } \ | |
566 | static ssize_t set_ ## name(struct sys_device *s,const char *buf,size_t siz) { \ | |
567 | char *end; \ | |
568 | unsigned long new = simple_strtoul(buf, &end, 0); \ | |
569 | if (end == buf) return -EINVAL; \ | |
570 | var = new; \ | |
571 | start; \ | |
572 | return end-buf; \ | |
573 | } \ | |
574 | static SYSDEV_ATTR(name, 0644, show_ ## name, set_ ## name); | |
575 | ||
576 | ACCESSOR(bank0ctl,bank[0],mce_restart()) | |
577 | ACCESSOR(bank1ctl,bank[1],mce_restart()) | |
578 | ACCESSOR(bank2ctl,bank[2],mce_restart()) | |
579 | ACCESSOR(bank3ctl,bank[3],mce_restart()) | |
580 | ACCESSOR(bank4ctl,bank[4],mce_restart()) | |
73ca5358 SL |
581 | ACCESSOR(bank5ctl,bank[5],mce_restart()) |
582 | static struct sysdev_attribute * bank_attributes[NR_BANKS] = { | |
583 | &attr_bank0ctl, &attr_bank1ctl, &attr_bank2ctl, | |
584 | &attr_bank3ctl, &attr_bank4ctl, &attr_bank5ctl}; | |
1da177e4 LT |
585 | ACCESSOR(tolerant,tolerant,) |
586 | ACCESSOR(check_interval,check_interval,mce_restart()) | |
587 | ||
91c6d400 AK |
588 | /* Per cpu sysdev init. All of the cpus still share the same ctl bank */ |
589 | static __cpuinit int mce_create_device(unsigned int cpu) | |
1da177e4 LT |
590 | { |
591 | int err; | |
73ca5358 | 592 | int i; |
91c6d400 AK |
593 | if (!mce_available(&cpu_data[cpu])) |
594 | return -EIO; | |
595 | ||
596 | per_cpu(device_mce,cpu).id = cpu; | |
597 | per_cpu(device_mce,cpu).cls = &mce_sysclass; | |
598 | ||
599 | err = sysdev_register(&per_cpu(device_mce,cpu)); | |
600 | ||
601 | if (!err) { | |
73ca5358 SL |
602 | for (i = 0; i < banks; i++) |
603 | sysdev_create_file(&per_cpu(device_mce,cpu), | |
604 | bank_attributes[i]); | |
91c6d400 AK |
605 | sysdev_create_file(&per_cpu(device_mce,cpu), &attr_tolerant); |
606 | sysdev_create_file(&per_cpu(device_mce,cpu), &attr_check_interval); | |
607 | } | |
608 | return err; | |
609 | } | |
610 | ||
611 | #ifdef CONFIG_HOTPLUG_CPU | |
612 | static __cpuinit void mce_remove_device(unsigned int cpu) | |
613 | { | |
73ca5358 SL |
614 | int i; |
615 | ||
616 | for (i = 0; i < banks; i++) | |
617 | sysdev_remove_file(&per_cpu(device_mce,cpu), | |
618 | bank_attributes[i]); | |
91c6d400 AK |
619 | sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_tolerant); |
620 | sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_check_interval); | |
621 | sysdev_unregister(&per_cpu(device_mce,cpu)); | |
622 | } | |
623 | #endif | |
624 | ||
625 | /* Get notified when a cpu comes on/off. Be hotplug friendly. */ | |
626 | static __cpuinit int | |
627 | mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) | |
628 | { | |
629 | unsigned int cpu = (unsigned long)hcpu; | |
630 | ||
631 | switch (action) { | |
632 | case CPU_ONLINE: | |
633 | mce_create_device(cpu); | |
634 | break; | |
635 | #ifdef CONFIG_HOTPLUG_CPU | |
636 | case CPU_DEAD: | |
637 | mce_remove_device(cpu); | |
638 | break; | |
639 | #endif | |
640 | } | |
641 | return NOTIFY_OK; | |
642 | } | |
643 | ||
644 | static struct notifier_block mce_cpu_notifier = { | |
645 | .notifier_call = mce_cpu_callback, | |
646 | }; | |
647 | ||
648 | static __init int mce_init_device(void) | |
649 | { | |
650 | int err; | |
651 | int i = 0; | |
652 | ||
1da177e4 LT |
653 | if (!mce_available(&boot_cpu_data)) |
654 | return -EIO; | |
655 | err = sysdev_class_register(&mce_sysclass); | |
91c6d400 AK |
656 | |
657 | for_each_online_cpu(i) { | |
658 | mce_create_device(i); | |
659 | } | |
660 | ||
661 | register_cpu_notifier(&mce_cpu_notifier); | |
1da177e4 LT |
662 | misc_register(&mce_log_device); |
663 | return err; | |
1da177e4 | 664 | } |
91c6d400 | 665 | |
1da177e4 | 666 | device_initcall(mce_init_device); |